haproxy负载均衡健康检查失败求助

 在使用haproxy配置三台web服务器使用web server负载均衡时，健康检查一直失败，监控down状态，服务无法注册。相关信息如下，求大神帮忙看下。

• springboot project web服务器
• HA-Proxy version 1.5.18 2016/05/10
• 如下健康检查配置的 URL均可以正常访问。

1. 192.168.40.128:9090/index.html
2. 192.168.40.129:9090/index.html
3. 192.168.40.130:9090/index.html

...
 
   # 打开监控
    stats                    uri           /status
    stats                    auth          admin:admin
    stats                    refresh       30s
    stats                    show-node
    stats                    show-legends

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  main *:9000

    default_backend           web_server


#--------------------------------------------------------------------
# backend web_server
#---------------------------------------------------------------------
backend web_server
    mode http
    cookie appsrv insert nocache
    balance     roundrobin
    option forwardfor
    #option http-server-close 
    option  httpchk GET /index.html
    #option httpchk HEAD /index.html HTTP/1.0
    #http-check expect  status 200

    #option httpchk HEAD /index.html HTTP/1.1


    server server1 192.168.40.128:9090 cookie server1 check inter 5000 rise 2 fall 5
    server server2 192.168.40.129:9090 cookie server2 check inter 5000 rise 2 fall 5   
    server server3 192.168.40.130:9090 cookie server3 check inter 5000 rise 2 fall 5

该问题已解决，确认是Linux服务器防火墙导致。